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<h1 id="servlet">servlet</h1>
<p>创建项目目录结构： 在您的工作目录中创建以下目录结构
<div class="language-bash highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>PasswordManager/
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>├──<span class="w"> </span>WEB-INF/
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>│<span class="w">   </span>├──<span class="w"> </span>classes/
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>│<span class="w">   </span>└──<span class="w"> </span>lib/
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>└──<span class="w"> </span>index.html
</span></code></pre></div>
这里，PasswordManager是项目根目录，WEB-INF目录包含Web应用程序的配置文件和类文件，classes目录用于存放编译后的Java类文件，lib目录用于存放项目依赖的库文件。
创建Servlet类： 在WEB-INF/classes目录下创建一个名为PasswordManagerServlet.java的文件。在这个文件中，编写一个继承自javax.servlet.http.HttpServlet的Java类。例如：
<div class="language-java highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">java.io.IOException</span><span class="p">;</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">javax.servlet.ServletException</span><span class="p">;</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="kn">import</span><span class="w"> </span><span class="nn">javax.servlet.annotation.WebServlet</span><span class="p">;</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="kn">import</span><span class="w"> </span><span class="nn">javax.servlet.http.HttpServlet</span><span class="p">;</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="kn">import</span><span class="w"> </span><span class="nn">javax.servlet.http.HttpServletRequest</span><span class="p">;</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="kn">import</span><span class="w"> </span><span class="nn">javax.servlet.http.HttpServletResponse</span><span class="p">;</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="nd">@WebServlet</span><span class="p">(</span><span class="s">&quot;/PasswordManagerServlet&quot;</span><span class="p">)</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">PasswordManagerServlet</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">HttpServlet</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w">    </span><span class="kd">private</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="n">serialVersionUID</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1L</span><span class="p">;</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">doGet</span><span class="p">(</span><span class="n">HttpServletRequest</span><span class="w"> </span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="n">HttpServletResponse</span><span class="w"> </span><span class="n">response</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">ServletException</span><span class="p">,</span><span class="w"> </span><span class="n">IOException</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="w">        </span><span class="c1">// 处理GET请求</span>
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">doPost</span><span class="p">(</span><span class="n">HttpServletRequest</span><span class="w"> </span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="n">HttpServletResponse</span><span class="w"> </span><span class="n">response</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">ServletException</span><span class="p">,</span><span class="w"> </span><span class="n">IOException</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="w">        </span><span class="c1">// 处理POST请求</span>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="p">}</span>
</span></code></pre></div>
编译Servlet类： 使用Java编译器（如javac）编译PasswordManagerServlet.java文件。在命令行中，导航到WEB-INF/classes目录，然后运行以下命令：
javac -cp "path/to/tomcat/lib/servlet-api.jar" PasswordManagerServlet.java
将path/to/tomcat替换为您的Tomcat安装目录。这将生成一个名为PasswordManagerServlet.class的文件。
配置web.xml文件： 在WEB-INF目录下创建一个名为web.xml的文件。在这个文件中，配置Servlet映射和其他Web应用程序设置。例如：
<div class="language-xml highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="nt">&lt;web-app</span><span class="w"> </span><span class="na">xmlns=</span><span class="s">&quot;http://xmlns.jcp.org/xml/ns/javaee&quot;</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w">         </span><span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w">         </span><span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://xmlns.jcp.org/xml/ns/javaee</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="s">                             http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd&quot;</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w">         </span><span class="na">version=</span><span class="s">&quot;3.1&quot;</span><span class="nt">&gt;</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w">   </span><span class="nt">&lt;servlet&gt;</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w">       </span><span class="nt">&lt;servlet-name&gt;</span>PasswordManagerServlet<span class="nt">&lt;/servlet-name&gt;</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w">       </span><span class="nt">&lt;servlet-class&gt;</span>PasswordManagerServlet<span class="nt">&lt;/servlet-class&gt;</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w">    </span><span class="nt">&lt;/servlet&gt;</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w">   </span><span class="nt">&lt;servlet-mapping&gt;</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w">       </span><span class="nt">&lt;servlet-name&gt;</span>PasswordManagerServlet<span class="nt">&lt;/servlet-name&gt;</span>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="w">        </span><span class="nt">&lt;url-pattern&gt;</span>/PasswordManagerServlet<span class="nt">&lt;/url-pattern&gt;</span>
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w">    </span><span class="nt">&lt;/servlet-mapping&gt;</span>
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="nt">&lt;/web-app&gt;</span>
</span></code></pre></div>
部署Web应用程序： 将整个PasswordManager目录复制到Tomcat的webapps目录下。然后，启动Tomcat服务器。Tomcat将自动部署您的Web应用程序。
访问Servlet： 在浏览器中访问http://localhost:8080/PasswordManager/PasswordManagerServlet（或您配置的其他端口），您应该能够看到Servlet处理的请求。
请注意，这种方法可能不如使用IDE方便，但它可以让您更深入地了解Java Web应用程序的开发过程</p>
<h1 id="jsp">JSP</h1>
<p>在不使用集成开发环境(IDE)的情况下创建一个JSP Web项目需要手动配置和编写一些基础文件。以下是一个基本步骤指南来帮助你从零开始创建这样一个项目：</p>
<h3 id="1">1. 准备工作</h3>
<ul>
<li><strong>安装Java</strong>: 确保你的计算机上安装了Java Development Kit (JDK)。你可以从Oracle的官方网站下载适合你操作系统的JDK版本。</li>
<li><strong>设置JAVA_HOME环境变量</strong>: 配置JAVA_HOME指向JDK的安装目录。</li>
<li><strong>安装Tomcat服务器</strong>: Tomcat是运行JSP和Servlet的常用服务器。从Apache Tomcat官网下载并解压到你选择的目录。</li>
<li><strong>设置CATALINA_HOME环境变量</strong> (可选): 如果你需要，可以设置这个环境变量指向Tomcat的安装目录。</li>
</ul>
<h3 id="2">2. 创建项目结构</h3>
<p>在你希望存放项目的目录下，手动创建以下目录结构：</p>
<div class="language-text highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>/myWebApp
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>  /WEB-INF
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>    web.xml
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>  /jsp
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a>    index.jsp
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a>  /css
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a>  /js
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a>  /images
</span></code></pre></div>
<ul>
<li><code>/myWebApp</code>: 你的项目根目录。</li>
<li><code>/WEB-INF</code>: 包含配置文件和类文件的私有目录。</li>
<li><code>web.xml</code>: 应用程序部署描述符，位于<code>WEB-INF</code>目录下，用于配置servlet、欢迎页面等。</li>
<li><code>/jsp</code>: 存放JSP文件的目录。</li>
<li>其他如<code>/css</code>, <code>/js</code>, <code>/images</code>用于存放前端资源。</li>
</ul>
<h3 id="3-webxml">3. 编写web.xml</h3>
<p>在<code>WEB-INF</code>目录下创建<code>web.xml</code>文件，并添加基础配置。例如，设置欢迎页面：</p>
<div class="language-xml highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="nt">&lt;web-app</span><span class="w"> </span><span class="na">xmlns=</span><span class="s">&quot;http://xmlns.jcp.org/xml/ns/javaee&quot;</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w">         </span><span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w">         </span><span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://xmlns.jcp.org/xml/ns/javaee</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="s">         http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd&quot;</span>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="w">         </span><span class="na">version=</span><span class="s">&quot;4.0&quot;</span><span class="nt">&gt;</span>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="w">    </span><span class="nt">&lt;welcome-file-list&gt;</span>
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="w">        </span><span class="nt">&lt;welcome-file&gt;</span>jsp/index.jsp<span class="nt">&lt;/welcome-file&gt;</span>
</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="w">    </span><span class="nt">&lt;/welcome-file-list&gt;</span>
</span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a><span class="nt">&lt;/web-app&gt;</span>
</span></code></pre></div>
<h3 id="4-jsp">4. 编写JSP文件</h3>
<p>在<code>/jsp</code>目录下创建<code>index.jsp</code>文件，这是你的网页入口点：</p>
<div class="language-jsp highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="k">&lt;%@</span><span class="w"> </span><span class="n">page</span><span class="w"> </span><span class="n">language</span><span class="o">=</span><span class="s">&quot;java&quot;</span><span class="w"> </span><span class="n">contentType</span><span class="o">=</span><span class="s">&quot;text/html; charset=UTF-8&quot;</span><span class="w"> </span><span class="n">pageEncoding</span><span class="o">=</span><span class="s">&quot;UTF-8&quot;</span><span class="k">%&gt;</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="cp">&lt;!DOCTYPE html&gt;</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="nt">&lt;html&gt;</span>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="nt">&lt;head&gt;</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="w">    </span><span class="nt">&lt;meta</span><span class="w"> </span><span class="na">charset=</span><span class="s">&quot;UTF-8&quot;</span><span class="nt">&gt;</span>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="w">    </span><span class="nt">&lt;title&gt;</span>My<span class="w"> </span>First<span class="w"> </span>JSP<span class="w"> </span>Page<span class="nt">&lt;/title&gt;</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="nt">&lt;/head&gt;</span>
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="nt">&lt;body&gt;</span>
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="w">    </span><span class="nt">&lt;h1&gt;</span>Hello,<span class="w"> </span>World!<span class="nt">&lt;/h1&gt;</span>
</span><span id="__span-5-10"><a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a><span class="nt">&lt;/body&gt;</span>
</span><span id="__span-5-11"><a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="nt">&lt;/html&gt;</span>
</span></code></pre></div>
<h3 id="5">5. 部署并运行</h3>
<ul>
<li>将整个<code>myWebApp</code>目录复制到Tomcat的<code>webapps</code>目录下。</li>
<li>启动Tomcat服务器。通常可以通过在命令行进入Tomcat的<code>bin</code>目录，然后执行<code>startup.sh</code>(Linux/macOS)或<code>startup.bat</code>(Windows)来完成。</li>
<li>打开浏览器，访问<code>http://localhost:8080/myWebApp/</code>（假设Tomcat的默认端口是8080），你应该能看到你的JSP页面。</li>
</ul>
<p>以上就是不使用开发工具创建JSP Web项目的基本步骤。虽然手动配置和管理项目比较繁琐，但它能帮助你更深入地理解Web应用的工作原理。随着项目复杂度的增加，使用像Eclipse、IntelliJ IDEA这样的IDE会更加高效。</p>
<p>要创建一个简单的JSP Web服务，用于显示数据、并实现对MySQL数据库的增删改查功能，你需要遵循以下步骤。这里我将提供一个基础示例来帮助你开始。请注意，在实际部署中，你应该考虑使用诸如Spring Boot或Struts这样的框架来更高效、安全地处理Web请求和数据库操作。</p>
<h3 id="1_1">1. 准备工作</h3>
<p>确保你已经安装了Java开发环境（JDK）和Tomcat服务器，并且你的系统中已安装MySQL数据库。还需要下载并配置MySQL的JDBC驱动（Connector/J）。</p>
<h3 id="2_1">2. 创建数据库和表</h3>
<p>首先，在MySQL中创建一个数据库和表作为例子：</p>
<div class="language-sql highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">DATABASE</span><span class="w"> </span><span class="n">mydatabase</span><span class="p">;</span>
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="n">USE</span><span class="w"> </span><span class="n">mydatabase</span><span class="p">;</span>
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a>
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">users</span><span class="w"> </span><span class="p">(</span>
</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="w">    </span><span class="n">id</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">,</span>
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="w">    </span><span class="n">name</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">50</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
</span><span id="__span-6-7"><a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="w">    </span><span class="n">email</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">50</span><span class="p">)</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span>
</span><span id="__span-6-8"><a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="p">);</span>
</span></code></pre></div>
<h3 id="3-mysql-jdbc">3. 添加MySQL JDBC驱动到项目</h3>
<p>将MySQL的JDBC驱动（例如mysql-connector-java-x.x.xx.jar）添加到项目的<code>WEB-INF/lib</code>目录下。</p>
<h3 id="4-jsp_1">4. 编写JSP页面</h3>
<p>创建一个名为<code>index.jsp</code>的文件，用于显示用户列表，并提供增删改查的表单或链接。</p>
<div class="language-jsp highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="k">&lt;%@</span><span class="w"> </span><span class="n">page</span><span class="w"> </span><span class="n">language</span><span class="o">=</span><span class="s">&quot;java&quot;</span><span class="w"> </span><span class="n">contentType</span><span class="o">=</span><span class="s">&quot;text/html; charset=UTF-8&quot;</span>
</span><span id="__span-7-2"><a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="w">    </span><span class="n">pageEncoding</span><span class="o">=</span><span class="s">&quot;UTF-8&quot;</span><span class="k">%&gt;</span>
</span><span id="__span-7-3"><a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="cp">&lt;!DOCTYPE html&gt;</span>
</span><span id="__span-7-4"><a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a><span class="nt">&lt;html&gt;</span>
</span><span id="__span-7-5"><a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="nt">&lt;head&gt;</span>
</span><span id="__span-7-6"><a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="nt">&lt;meta</span><span class="w"> </span><span class="na">charset=</span><span class="s">&quot;UTF-8&quot;</span><span class="nt">&gt;</span>
</span><span id="__span-7-7"><a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="nt">&lt;title&gt;</span>User<span class="w"> </span>Management<span class="nt">&lt;/title&gt;</span>
</span><span id="__span-7-8"><a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="nt">&lt;/head&gt;</span>
</span><span id="__span-7-9"><a id="__codelineno-7-9" name="__codelineno-7-9" href="#__codelineno-7-9"></a><span class="nt">&lt;body&gt;</span>
</span><span id="__span-7-10"><a id="__codelineno-7-10" name="__codelineno-7-10" href="#__codelineno-7-10"></a><span class="w">    </span><span class="nt">&lt;h2&gt;</span>User<span class="w"> </span>List<span class="nt">&lt;/h2&gt;</span>
</span><span id="__span-7-11"><a id="__codelineno-7-11" name="__codelineno-7-11" href="#__codelineno-7-11"></a><span class="w">    </span><span class="k">&lt;%</span>
</span><span id="__span-7-12"><a id="__codelineno-7-12" name="__codelineno-7-12" href="#__codelineno-7-12"></a><span class="w">        </span><span class="c1">// 这里仅为示意，实际应用中应使用DAO模式或Service层处理数据库操作</span>
</span><span id="__span-7-13"><a id="__codelineno-7-13" name="__codelineno-7-13" href="#__codelineno-7-13"></a><span class="w">        </span><span class="n">Class</span><span class="p">.</span><span class="na">forName</span><span class="p">(</span><span class="s">&quot;com.mysql.cj.jdbc.Driver&quot;</span><span class="p">);</span>
</span><span id="__span-7-14"><a id="__codelineno-7-14" name="__codelineno-7-14" href="#__codelineno-7-14"></a><span class="w">        </span><span class="n">java</span><span class="p">.</span><span class="na">sql</span><span class="p">.</span><span class="na">Connection</span><span class="w"> </span><span class="n">conn</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">DriverManager</span><span class="p">.</span><span class="na">getConnection</span><span class="p">(</span>
</span><span id="__span-7-15"><a id="__codelineno-7-15" name="__codelineno-7-15" href="#__codelineno-7-15"></a><span class="w">            </span><span class="s">&quot;jdbc:mysql://localhost:3306/mydatabase&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;username&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;password&quot;</span><span class="p">);</span>
</span><span id="__span-7-16"><a id="__codelineno-7-16" name="__codelineno-7-16" href="#__codelineno-7-16"></a><span class="w">        </span><span class="n">Statement</span><span class="w"> </span><span class="n">stmt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">createStatement</span><span class="p">();</span>
</span><span id="__span-7-17"><a id="__codelineno-7-17" name="__codelineno-7-17" href="#__codelineno-7-17"></a><span class="w">        </span><span class="n">ResultSet</span><span class="w"> </span><span class="n">rs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">stmt</span><span class="p">.</span><span class="na">executeQuery</span><span class="p">(</span><span class="s">&quot;SELECT * FROM users&quot;</span><span class="p">);</span>
</span><span id="__span-7-18"><a id="__codelineno-7-18" name="__codelineno-7-18" href="#__codelineno-7-18"></a><span class="w">        </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="na">next</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-7-19"><a id="__codelineno-7-19" name="__codelineno-7-19" href="#__codelineno-7-19"></a><span class="w">            </span><span class="n">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="s">&quot;ID: &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">rs</span><span class="p">.</span><span class="na">getInt</span><span class="p">(</span><span class="s">&quot;id&quot;</span><span class="p">)</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;, Name: &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">rs</span><span class="p">.</span><span class="na">getString</span><span class="p">(</span><span class="s">&quot;name&quot;</span><span class="p">)</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;, Email: &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">rs</span><span class="p">.</span><span class="na">getString</span><span class="p">(</span><span class="s">&quot;email&quot;</span><span class="p">)</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;&lt;br&gt;&quot;</span><span class="p">);</span>
</span><span id="__span-7-20"><a id="__codelineno-7-20" name="__codelineno-7-20" href="#__codelineno-7-20"></a><span class="w">        </span><span class="p">}</span>
</span><span id="__span-7-21"><a id="__codelineno-7-21" name="__codelineno-7-21" href="#__codelineno-7-21"></a><span class="w">        </span><span class="n">rs</span><span class="p">.</span><span class="na">close</span><span class="p">();</span>
</span><span id="__span-7-22"><a id="__codelineno-7-22" name="__codelineno-7-22" href="#__codelineno-7-22"></a><span class="w">        </span><span class="n">stmt</span><span class="p">.</span><span class="na">close</span><span class="p">();</span>
</span><span id="__span-7-23"><a id="__codelineno-7-23" name="__codelineno-7-23" href="#__codelineno-7-23"></a><span class="w">        </span><span class="n">conn</span><span class="p">.</span><span class="na">close</span><span class="p">();</span>
</span><span id="__span-7-24"><a id="__codelineno-7-24" name="__codelineno-7-24" href="#__codelineno-7-24"></a><span class="w">    </span><span class="k">%&gt;</span>
</span><span id="__span-7-25"><a id="__codelineno-7-25" name="__codelineno-7-25" href="#__codelineno-7-25"></a><span class="w">    </span><span class="cm">&lt;!-- 实现增删改查的链接或表单可以在这里添加 --&gt;</span>
</span><span id="__span-7-26"><a id="__codelineno-7-26" name="__codelineno-7-26" href="#__codelineno-7-26"></a><span class="nt">&lt;/body&gt;</span>
</span><span id="__span-7-27"><a id="__codelineno-7-27" name="__codelineno-7-27" href="#__codelineno-7-27"></a><span class="nt">&lt;/html&gt;</span>
</span></code></pre></div>
<h3 id="5-webxml">5. 配置web.xml</h3>
<p>在<code>WEB-INF</code>目录下，确保你有<code>web.xml</code>文件来配置应用程序的入口点。对于这个简单的例子，直接访问JSP页面即可，无需额外配置。</p>
<h3 id="6-tomcat">6. 部署到Tomcat</h3>
<p>将整个项目打包成WAR文件，或者直接将项目目录放到Tomcat的<code>webapps</code>目录下，然后启动Tomcat服务器。</p>
<h3 id="_1">注意事项</h3>
<ul>
<li><strong>安全性</strong>：上述代码直接在JSP页面中进行数据库操作是不推荐的做法，因为这会暴露数据库登录信息，并且不符合MVC设计模式。在实际应用中，应该将数据库操作放在Servlet或独立的Java类（如DAO）中。</li>
<li><strong>错误处理</strong>：示例中没有包含任何错误处理逻辑，实际应用时需要添加异常捕获和处理。</li>
<li><strong>参数化查询</strong>：为了防止SQL注入攻击，应使用PreparedStatement进行参数化查询。</li>
</ul>
<p>以上是一个非常基础的例子，仅用于演示目的。在实际开发中，建议采用更先进的技术栈和设计模式来提升应用的安全性、可维护性和性能。</p>












                
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